Which of the following can be classified as a mixture?

a
pure air
b
pure water
c
pure nitrogen
d
pure gold

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

Which of the following statements is false regarding aromaticity? a. the compound must be cyclic b. the compound must be fully conjugated c. the compound must be planar d.the number of electrons in the pi system must satisfy the hückel 4n+2 rule e. the compound must have a neutral charge

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland